Add check if CreditApplication already exists for user (server validation).

Add 3 ApprovalTasks after creation of CreditApplication.
Add list of tasks by user role on WorkQueue page.
Merge branch 'master' of https://github.com/xixi4Den/Credits

Conflicts:
	AvDB_lab4/Business/Credits/Implementation/CreditApplicationManager.cs
	AvDB_lab4/Business/Credits/Interfaces/ICreditApplicationManager.cs
	AvDB_lab4/Controllers/ApplicationController.cs
	AvDB_lab4/Infrastructure/AutoMapperConfig.cs